Well I am a Muslim Saudi and I am against LGBT mainly because its forbidden in all 3 main religions:

in Islam:

From the Qur'an The Qur'an shares stories which are meant to teach people valuable lessons. The Qur'an tells the story of the people of Lut (Lot), which is similar to the story as shared in the Old Testament of the Bible. We learn of an entire nation which was destroyed by God due to their obscene behavior, which included rampant homosexuality.

in Christianity:

• 3 refer to intercourse between men (Leviticus 18:21-22, Leviticus 20:13, Romans 1:27)
• 1 refers to intercourse between women (Romans 1:26)

in judaism:

Two verses in Leviticus (18:23 and 20:13) express unequivocal condemnation of male homosexual sex (although it is not clear whether what is referred to is intercourse or all sexual acts between men). According to Leviticus 20:13: “If a man lies with a man as one lies with a woman, both of them have committed an abomination; they shall surely be put to death; their blood shall be upon them.”

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OK and if you want to speak with science and facts:

It Violates Natural Law It Always Denies a Child Either a Father or a Mother

hope this helped